Computer programming (often shortened to programming or coding) is the process of writing, testing, debugging/troubleshooting, and maintaining the source code of computer programs. This source code is written in a programming language. The code may be a modification of an existing source or something completely new. The purpose of programming is to create a program that exhibits a certain desired behavior (customization). The process of writing source code often requires expertise in many different subjects, including knowledge of the application domain, specialized algorithms and formal logic. Common programming languages include C, C++, C#, and Java. Other languages differing slightly in usage from these are known as scripting languages. Examples are Python(very popular), Perl, PHP, and Ruby. HTML (HyperText Markup Language) and XML (Extensible Application Markup Language) are markup languages. It is not considered as a programming language.
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